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The error indications (01, 02 or 06) show what type of malfunction has occurred. When an error indication appears, the camcorder turns off automatically. Remove the power supply (battery, etc.) and wait a few minutes for the indication to clear. When it does, you can resume using the camcorder. If the indication remains, consult your nearest JVC dealer.

When playing the tape in the camera itself, do you hear sound? If so, its something with the connection cable... is not, you will need a professional repair, you can do nothing except the head clean which you did?
Sorry.